AVES. 
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and thick; four toes, all directed forward, entirely free, and 
consisting of two phalanges each, strong, and armed with thick 
and hooked claws ; tail consisting of ten feathers ; wings very 
long, the first quill being somewhat longer than the second. 
Cypselus unicolor. — The One-Coloured Swift. 
Plate LII. fig. 4. 
Dull black, with greenish reflections; throat paler; wings 
forked and very long, extending an inch and a quarter beyond 
the tail. Six inches and a quarter long. Inhabits Madeira. 
Genus 3.— CAPRIMULGUS.— Linnceus. 
Generic Character. —Bill a little curved, very small, de¬ 
pressed at the base, and surrounded in most species by long 
stiff tapering bristles ; upper mandible slightly bent at the tip ; 
gape very wide; nostrils basal, tubular, covered by a membrane, 
surmounted by hairs, and surrounded by an elevated ring; 
wings long, the first quill longer than the second; tail round or 
forked, consisting of ten feathers ; legs short, feet small, toes 
adhering as far as the first joint; middle claw long, and serrated 
at the edge, but smooth in some foreign species; hallux rever¬ 
sible. 
Caprimulgus Europaus .— The European Goat-Sucker, or 
Night Jar. 
Plate LII. fig. 5. 
Ash gray, spotted and streaked with yellow-brown ; throat 
with large white spots ; under parts with transverse black-brown 
bars; outer webs of quills scalloped with orange-brown; tail 
with zigzag bars of black; legs short, squamose, and feathered 
under the knee. Ten inches long. Inhabits Europe. 
Genus 4.—POD ARGUS.— llliger. 
Generic Character. —Bill broader than the head, short and 
abruptly acuminated towards the point, which is considerably 
bent, surrounded by stiff bristles ; upper mandible spatuliform 
and carinated; nostrils linear, basal, and hidden by the nuchal 
bristles; wings shorter than the tail; tarsus short, strong; 
toes separate ; claws nearly of equal length. 
